30 lines
760 B
Plaintext
30 lines
760 B
Plaintext
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/**
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* Create a subclass that can be modified without affecting the super class.
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*
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* @template {{prototype: object, new (...args: any[]): any}} Class
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* @param {Class} Super
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* @return {Class}
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*/
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export function unherit(Super) {
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const Of = class extends Super {}
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// Clone values.
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const proto = Of.prototype
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/** @type {string} */
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let key
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// We specifically want to get *all* fields, not just own fields.
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// eslint-disable-next-line guard-for-in
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for (key in proto) {
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/** @type {unknown} */
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const value = proto[key]
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if (value && typeof value === 'object') {
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// @ts-expect-error: shallow clone arrays or other values.
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proto[key] = 'concat' in value ? value.concat() : Object.assign({}, value)
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}
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}
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return Of
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}
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